well now you've done it Henrik

i was just warming up to the idea of doing everything in a polled loop and carefully squeezing activities in

re DT-Ints when you say "soft timing" do you mean things like counting the number of times through the Main Loop (or sub loop) to create a crude counter / timer ?
i do that a lot for certain imprecise timing requirements, yeah i know it is not good practice and has many down sides but it is good enough for many things

or do you mean things like PAUSE and PAUSEus ?
or both ?

my plan at the moment is to use 18F25K22 (Charles has been most supportive!) and it will do 64Mhz and does 5V which the '20 does not (big advantage as DMX transceiver i am told must be 5V due to custom and practice even though there are 3.3V RS485 transceiver chips out there)

as to OSC, the way i read the data sheet i can get 64MHz using 4X PLL either with INTOSC or XTAL at 16MHz
do you think 1% is good enough for RS-485 250k baud comms ?
my instinct was no and at this point am not inclined to get into calibration schemes (how good do they get?)